A boy is trying to climb a slippery pole and finds that he can climb to a height of at least 1-850 m once in five attempts, and to a height of at least 1-700 m nine times out of ten attempts. Assuming that the heights he can reach in various attempts form a normal distribution, calculate the mean and standard deviation of the distribution. Calculate also the height that the boy can expect to exceed once in one thousand attempts.

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